DoenÃas fÃngicas e bacterianas em algumas espÃcies de Araceae / Fungicals and bacterials diseases in some Araceae species

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Among the cultivated tropical ornamental plants, those belonging to the Araceae family are among the most important ones, because of its unique features such as beauty, durability, exoticity of forms and high acceptance in the international market. However, plant pathogens, such as fungi and bacteria, can damage inflorescence and shoot quality, consequently reducing plant trade. Thus, this work was performed with the objective to know fungal and bacterial diseases on aroids. For that, symptomtics parts were sampled from plants belonging to Araceae, from January to November 2005 from commercial growers of UFLA, Registro â SP, domestic backyards in Lavras â MG, Tiradentes â MG, Rio Verde â GO and Rio de Janeiro â RJ. Those samples were analyzed for micologycal and bacteriological studies in the Laboratories of Mycology and Bacteriology of the Department of Plant Pathology from the Universidade Federal de Lavras, by direct examination of lesions on microcope, hangin drop slide test, isolation, pathogenicity tests, hypersensitive reaction, DNA extraction and PCR. The studied plant materials were herborized and shelved in the Laboratory of Bacteriology and glass slides containing structures of the studied fungi were stored. Four basics disorders were identified. Fungi from the genera Colletotrichum and Glomerella, and the bacteria from the genera Xanthomonas and Erwinia were the most frequent. Glomerela cingulata and Colletotrichum gloeosporioides were observed in anthure and singonio, Colletotrichum falcatum in peace lilies and singonio, Cercospora richardiaecola in calla lilies, Xanthomonas spp. in anthure and calla lilies, and Erwinia spp. was observed only in calla lilies. In cross pathogenicity tests, the isolates of Colletotrichum gloeosporioides and C. falcatum induced necrotic lesions in anthure, green pepper, peace lily and singonio plants. Strains of Xanthomonas sp. induced necrotic lesions in all aroids plants, but not in tomato. Xanthomonas vesicatoria induced lesions only for calla lily and tomato plants.

ASSUNTO(S)

ornamental plant bacteria bactÃria diagnosis diagnose planta ornamental fungus fungo fitopatologia

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